I have a holley carb and when i adjust the air fuel mix screws all the way in its the idle is supposed to go down but mine goes up when u close them does anybody know what this means?
Carb adjustment
- Thread starter Cutty454
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those are air bleed screws...the more you turn them in your cutting off the air and the richer the idle gets
what model of carb do you have? I had a holley with the reverse idle set up and I got rid of the crab and went back to a q-jet. I forget what I set them at, I think I changed it every day, but you can use a vacuum gauge to help you set them up
Im not sure of the model Im gonna have to get the serial number and look it up I bought it a couple years ago I know its a 700/750 double pumper with manual choke and i just changed the power valve to a 5.5 bc I blew it I dk if that the right size though when I tried to check the vaccumm the needle on the gage kept jumping around
the reason I asked is cause holley put out some carbs that were supposed to be a q-jet replacement and it used the reverse idle meaning the idle mixture screw were actually an airbleed adjustment like yours is. I had one and gave it to a friend of mine after I tried many times to get it to run right. My friend loves holly's and I told him her didn't have to pay me for the carb till he gets is running right....he's an honest guy and he hasn't paid me yet...
pontiacgp said:
lol I like that story is there anyway to find the correct adjustments for it or something close?
I contacted Holley a few times about that carb, they suggested it might need to be rebuilt but when I told them I bought it new and had less than 1000 miles on it they had no suggestions. They were also silent when I suggested I get a refund. I'd take it apart, clean it even thought it didn't need it and put it back together and for about a week it would run good and then it wouldn't idle and run like crap. Online I found out those models had a bunch of complaints and basically were junk, that's when I got rid of it
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